if you have a weather station use station or absolute which js the same as you set your reference altitude in your baro readings to zero then you can measure what your actual pressure is where you are shooting.
once you get your head around it its not a problem.
I had my kestrel on on when we drove up the comet the other day and noticed an inch change in hg pressure which made approx .1 mill of difference change of impact at 600 yd.
Temp is a pretty important but humidity nothing
Practice is the name of the game!
I had plenty this weekend with about 70 goats on the deck with nothing closer than 300 and good consistint hits out to 770 with the dirty old 6.5 so all good
Pm me if you want and i can run you through it if you want
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